DEVICE FOR ARC-LESS COMMUTATION OF DIRECT CURRENT ELECTRIC CIRCUIT Russian patent published in 1998 - IPC

FIELD: electrical engineering. SUBSTANCE: device has main contact which is by-passed by serial circuit of n additional contacts, n-1 of which are by-passed of non-linear resistive elements. Load is by-passed by reverse-connection diode. By-pass of additional contacts and correct choice of breakthrough voltage quenches arc when contacts are switched off. When contacts are closed in normal position, method of their switch- off involves opening main contact, transition of load current to circuit of additional contacts, opening first additional contact, transition of load current to by-pass circuit with reverse-connection diode, opening second additional contact. This finishes switch-off cycle. The process of quenching of load current of reactance load to circuit with reverse-connection diode is accelerated by introduced power resistor or power non-linear resistive element. EFFECT: increased speed of quenching power which is accumulated in magnetic field of inductance load, decreased size. 3 dwg